smooth_shape API is not working

[arvindg007]

I tried smooth_shape (https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__meshing__grp.html#ga57fa999abe8dc557003482444df2a189)
API which takes FaceRange as input, but it is not updating mesh at all.
On debug I noticed that it fails because smoother.solve_system returns false. Internally solver is giving NumericalIssue error.

whereas for same face ranges other API works. I want to use smooth_shape for smoothening some faces of the mesh.

Any idea what could be the reason?

[MaelRL]

What do you mean by "other API"? Can you please provide the exact input (data + parameters)?